Currently mixing his football with a business studies degree at UTS, Aspropotamitis also models his game on other defenders, the likes of Brazilian Thiago Silva, German star Mats Hummels and English young gun John Stones.

“Stones is a very young player like me, and still learning his trade," Aspropotamitis told AAP recently.

"I look up to those guys a lot. I've watched a lot of football, and just taken a lot from a lot of world-class players' games. As I've gotten older, I've tried to put it into my game."

And it’s obviously worked.

Just 24 games into his Hyundai A-League career, Aspropotamitis is now a regular starter under Popovic and has kept Caltex Socceroo Robbie Cornthwaite out of the XI in recent months (though the pair are likely to be in the centre of defence for Saturday night's Sydney Derby).

“Popa” has great faith in the youngster, which is why he didn’t go out and buy another defender when skipper Nikolai Topor-Stanley left at the start of the season, in the knowledge Aspro was ready to step up.

He showed his quality last Friday night in a fantastic battle with Tim Cahill.

Aspro got the better of the Caltex Socceroos legend, winning 100% of his duels over the 90 minutes, while he’s currently eighth in the Hyundai A-League for blocked shots.

But before any of that there’s the small matter of a Sydney Derby on Saturday night.